28535215 has 4 divisors (see below), whose sum is σ = 34242264. Its totient is φ = 22828168.

The previous prime is 28535167. The next prime is 28535261. The reversal of 28535215 is 51253582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28535215 - 2¹⁷ = 28404143 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2853517 + ... + 2853526.

It is an arithmetic number, because the mean of its divisors is an integer number (8560566).

Almost surely, 2^28535215 is an apocalyptic number.

28535215 is a deficient number, since it is larger than the sum of its proper divisors (5707049).

28535215 is an equidigital number, since it uses as much as digits as its factorization.

28535215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5707048.

The product of its digits is 12000, while the sum is 31.

The square root of 28535215 is about 5341.8362947586. The cubic root of 28535215 is about 305.5814938985.

Adding to 28535215 its reverse (51253582), we get a palindrome (79788797).

The spelling of 28535215 in words is "twenty-eight million, five hundred thirty-five thousand, two hundred fifteen".